Definition of Done
The team agrees on, and displays prominently somewhere in the team room, a list of criteria which must be met before a product increment "often a user story" is considered "done". Failure to meet these criteria at the end of a sprint normally implies that the work should not be counted toward that sprint's velocity.
Also Known As
Software developers have a reputation for being somewhat careless when answering the question "are you done with this feature"? In fairness, this is an ambiguous question - it can mean "done programming" and this is generally what a developer will have in mind when answering. However, the meaning of interest is usually "are you done programming, creating test data, actually testing, ensuring it's deployable, documenting...".
Proverbially, to get an answer to that, the question to ask is, "I know that you are done, but are you DONE-done?". See also "READY-ready".
Some teams use the term "Done List" or "Done Checklist"; the less widespread term "product sashimi" offers a compelling image of well-defined slices of a product.
- the Definition of Done provides a checklist which usefully guides pre-implementation activities: discussion, estimation, design
- the Definition of Done limits the cost of rework once a feature has been accepted as "done"
- having an explicit contract limits the risk of misunderstanding and conflict between the development team and the customer or product owner
- obsessing over the list of criteria can be counter-productive; the list needs to define the minimum work generally required to get a product increment to the "done" state
- individual features or user stories may have specific "done" criteria in addition to the ones that apply to work in general
- if the definition of done is merely a shared understanding, rather than spelled out and displayed on a wall, it may lose much of its effectiveness; a good part of its value lies in being an explicit contract known to all members of the team
- 2002: an early article by Bill Wake calls attention to the possible inconsistencies arising from terms commonly used within teams, such as "done"
- 2003: early Scrum training materials hint at the future importance of the "Definition of Done", initially only in the form of a slide title: "The story of Done"
- 2005: the first exercises inviting Scrum trainees to reflect on their (local) "definition of done" appear in later iterations of Scrum training materials
- 2007: by that point the "Definition of Done" as a full-fledged practice, and as a textual checklist displayed in the team room, has become widespread
Signs of Use
- upon request, the team can point to its explicit Definition of Done
- the team actually uses the Definition of Done at the end of a sprint to justify the decision to count work towards velocity or not